Spring-tooth harrow



' (No Model) M J TODD SPRING TOOTH HARROW.

1%.. 556,290; Patented Mar. 10., 1896.

UNITED STATES PATENT OFFICE.

MARQUIS J. TODD, OF BUFFALO, NETV YORK.

SPRING-TOOTH HARROW.

SPECIFICATION formingpart of Letters Patent No. 556,290, dated March 10,1896. Application filed December 3,1894. Serial No. 530,696. (No model.)

To all whom, it may concern.-

Be it known that I, MARoUIs J. TODD, of Buffalo, in the county of Erieand State of New York, have invented certain new and useful Improvementsin Spring Tooth Harrows; and I do hereby declare the following to be afull, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

This invention contemplates certain new and useful improvements inspring-tooth harrows, and has reference more particularly to the meansemployed for binding and holding the harrow-teeth to the tooth-bars.

The object of the invention is to provide a clip or holder that willallow an individual adjustment of the tooth, and which when fastened tothe tooth-bar will be firmly grasped or held by the latter as againstlateral displacement, thereby not only securing the tooth firmly to itsseat but also causing the tooth-bar to securely hold the clip or holderin position. This I accomplish by making the tooth-bar with a continuousslot extending from end to end thereof and passing the tooth-clip upthrough said slot and through the bar in such manner that when the clipis fastened and the tooth is drawn to its seat the longitudinal sideedges of the slot in the bar will bind firmly against that portion ofthe clip or holder located in said slot. The clip is provided with aninclined seat for the tooth and has upper wedge-like surfaces whichcontact with the sloping walls or sides of the tubular bar adjacent tothe slot therein, so that when the clip is firmly bound to the bar thewedge-like surfaces of the clipseat acting on the bar will force thelongitudinal edges of the slot in said bar against said clip. Thiscurved tooth-seat is preferably formed integral with the clip or holder,but in some instances may be made separable therefrom.

The invention comprises the novel features of construction, andalso thedetail combination and arrangement of parts, substantially ashereinafter fully set forth and particularly pointed out in the claims.

In the accompanying drawings, Figure 1 is a vertical sectional view of atooth-bar with a tooth secured in position. Fig. 2 is a similar Viewwith the parts slightly loosened. Fig. 3 is a detail View of the clipdetached. Fig. 4 is aview of the clip with separable tooth-seat.

Referring to the drawings, A designates a tooth-bar, which is of tubularform and is made with a continuous longitudinal slot a, which extendsfrom end to end of said bar. At the point of location of theharrow-tooth and diametrically opposite the slot is a hole or opening a.

B is-a clip or holder having alower stirruplike end I), and an upperthreaded extension I), which, when projected through the hole or openinga, has a small binding-nut 19 secured thereon. The lower cross-bar b ofthis stirrup-like end is connected to the outer ends of two divergentarms 19 with the inner or convergent ends of which the extension Z) isformed. The tooth-seat O is formed with these divergent arms 5 and issufficiently far from the cross-bar b to leave an opening to accommodatethe harrow-tooth D. The under side of this tooth-seat C is curved on asmaller radius than the barrow-tooth, which fits snugly between the sideflanges d, the latter serving to prevent lateral displacement of thetooth. This tooth-seat extends laterally on either side of the clip, andits upper surface cl is curved, the radius of the curvature being lessthan that of the tubular tooth-bar with which the seat has a wedge-likecontact. In screwing home the binding-nut b the clip is drawn up throughthe tooth-bar, and by reason of the wedge-like action of the toothseat,the ends of the latter force the longitudinal edges of the slot in saidbar against the sides of the tooth-clip and press downwardly on thetooth, causing the curvature of the latter to conform to that of theseat, thus binding the tooth to its seat and securely holding the clipbetween the longitudinal edges of the slot in thetooth-bar, preventingany lateral movement or displacement thereof.

In Fig. 4 I have shown the tooth-seat E made separate from thestirrup-like end, which latter is designed to extend through thelongitudinal slot or opening in said seat. From the connecting ends ofthis seat project lugs e of substantially the same width as thedivergent arms Z)" of the tooth-clip. These lugs also extend up into theslot a of the tooth-bar A, so that when the clip is bound to the bar thelongitudinal edges of the slot in the latter bind not only against thesides of the tooth-clip, but also against the ends of said lugs, thusserving to firmly hold the clip and seat as well as the tooth.

I claim as my invention 1. In a harrow having a tooth-bar provided witha longitudinal slot and a hole or opening, a clip or holder extendingthrough said tooth-bar and having its upper end projecting through saidhole or opening to receive a binding-nut, a harrow-tooth and a toothseatbetween which and the lower end of said clip or holder said tooth isdesigned to fit, said seat having an upper curved or wedgelike surfaceof a smaller radius than said tooth-bar with which latter it is designedto engage, whereby when said tooth is seated the longitudinal edges ofthe slot in said tooth-bar will be drawn against the opposite sides ofsaid clip or holder, substantially as set forth.

2. In a harrowhavinga tooth-bar provided with a longitudinal slot and ahole or opening, a clip or holder extending through said tooth-bar andhaving its upper end projected through said hole or opening to receive abinding-nut, a harrow-tooth, and a tooth-seat having a lower curvedsurface of smaller radius than said tooth and also having its uppersurface curved 011 a radius smaller than said tooth-bar, whereby when.said tooth is seated the longitudinal edges of the slot in saidtooth-bar will be drawn against the opposite sides of said clip orholder, substantially as set forth.

3. In a harrow having a tooth-bar provided with a longitudinal slot andan upper hole or opening, a clip or holder having a lower stirrup-likeend and an upper threaded extension designed to project through saidhole or opening, a binding-nut thereon, a tooth-scat above the lowercross-bar of said stirrup-like end having a lower curved portion and anupper curved or wedge-like surface of smaller radius than said tooth-baragainst which lat ter it is designed to bind, substantially as and forthe purpose set forth.

l. The clip or holder herein described having a lower stirrup-like endcomprising two divergent arms and a lower cross-bar connecting saidarms, and a curved tooth-scat formed integral with said divergent armsan d extending laterally on either side of said stirruplike end, andhaving upper curved or wedgclike surfaces, in combination with atooth-bar having a longitudinal slot extending from end to end and anupperhole or opening, said clip or holder being designed to projectthrough said tooth-bar and secured at its outer end, whereby thelongitudinal edges of. said slot will be caused to bind against thesides of said clip or holder, substantially as set forth.

In testimony whereof I have signed this specification in the presence oftwo subscribing witnesses.

MARQUIS J. TODD.

\Vitnesses J. NOTA MeGILL, WM. S. lioness.

